The pregens available, if I remember Mr. Overlord correctly, are not quite out of the book... they have been rebuilt in Hero Lab to bring them into accordance with character generation rules. However, the book pregens tend to suck. If you have not played Shadowrun in some time, you will need to refamiliarize yourself with the rules, as the game has COMPLETELY changed since 1st edition. I suggest you pick up the SR5 core rulebook, look at the pregens in the book, and make your own version of one that appeals to you.
The characters I ran with tended to be very magic-centric. Having a mundane based in technology (gunbunny, gillette, decker, mundane face) might not be a bad idea.
Play what you want, just sayin'.